Hosting is giving your website a home on the Internet. You have to publish your website to a special Internet computer (server), so it can be accessed by other people via the Internet. If you already have space on the Internet, you can ignore this option.
If you do not have space, then this option allows you to sign up with a hosting company so you can immediately publish your website to the Internet with point and click ease.
It also provides you with your own Internet address, if you do not yet have one.